"Thank you to everyone for their good wishes re @hilariabaldwin," the SAG Award-winning actor tweeted early Friday.

That means his 17-year-old daughter, Ireland, whom he had with ex-wife Kim Basinger, will have a sister. Alec and Hilaria tied the knot last June and announced the baby news in February after she found out two days before Christmas that she was pregnant.

Baldwin, however, was hoping for a little boy so that he could name him Massimo.

"It's a lovely name," his bride said on the "Rachael Ray Show" before she learned the gender. "I just don't know. That's a very big name for a very little baby."